Violet-black azo dye.



lUNITED @TATES PATENT @FIQE.

WAIJTER KCNIG, OF ELBERFELD, GERMANY, ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY.

VIOLET-VBLACK AZO DYE.

are. 874,968.

Specification of Letters Patent.

Patented Dec. 31, 1907.

Application filed August 26. 1907- Serial No, 390,246.

To all whom it may concern:

Be it known that I, WALTER KoNIG, doctor of technical arts, chemist, citizen of the German Empire, residing at Elberfeld, Germany, Kingdom of Prussia, have invented" new and useful Improvements in New -Azo Dyes, of which the following is a specification.

This invention relates to the preparation of new azo-d estuffs having the following Ill.

They are very good level acid dyeing colors of strong covering power, producingon wool from brown to deep black shades of good, fastness to washing. Cotton checking threads in wool pieces are not dyed by the new colors.

In carrying out the new process pi actically I can proceed as follows, the arts being by weight: 31.7 parts of l-naphtliylamin-4- sulfonate of sodium are diazotized in the usual manner by means of hydrochloric acid and. 7 parts of sodium nitrite. The diazocompound is then added with stirring to a solution of 15 parts of l-amino-7-na hthol in e parts of NaOH and an. excess 0 sodium carbonate solution. The dyestuff is filtered ofi, ressed and dried. It is, after being .drie and pulverized, in the shape of its'so- Letters Patent is dium salt a dark powder soluble in' Water with a violet color and being soluble in concentrated sulfuric acid with a violet color.

By reduction with stannous chlorid-and hydrochloric acid 1naphthyla111in-4-sulfoni0 acid and 1.S-naphthylenediaminJ-naphthol are obtained. The new dyestufi dyes wool from acid baths violet-black shades.

The process is carried out in an analogous manner on using other of the above mentioned diazocompounds.

In the following table the shades on wool of solne of the new dyestuffs are given.

1 1-nsphthy1amin-2-sulfonic acid... Dcep'i violet- 1'8 2) 1-naphthyiamin-3-sulfonic acid. Rcddish-violet-black. 3) l-naphthylamin-4-suiionic acid. violot black. 4) l-naphthylamin-5-sulfonic acid Violet-black. 5) l-naphthylamin-G-sulfonic acid. Reddish v10 1. 7 aminolet-black. 6) l-naphthylamin-Fsulfonic acid naphthol. Bluish violet black. 7) 1 amino -2 -napl1tl1oi -ethylct11er B l u i s h viosuifonie acid. v let-black. 8) l-naphthylamin-ZA-disuifonic acid. R e d d is hbrown. 9) l-naphthylamin-4.7-disulfonic acid. -Yiolet-black.- 10) l-naphthylamin-5.7-disulfonic acid.

Violet-black.

Having now'described my invention and in what manner the same is to be performed, what I claim as new and desire to secure by l. The hereindescribed new azo dyestuffs having the above given formula, obtainable by combining in alkaline solution sulfonic acids of l-naphthylamin compounds with 1-a1nino-7-naphthol,- which dyestuffs are, after being dried and pulverized, in the shape of their alkaline salts dark powders soluble in water; yielding u on reduction with stannous chlorid and ydrochloric acid sulfonic acids of 1 -naphthyl-. aniin compounds and 1.8-naphthylendiamin-7-naphthol; and dyeing wool: fromacid baths generally from brown to blackshades,

substantially as described.

2. The herein-described newazodyestutf obtainable by combining in alkaline solutibn the diazo compound of 'I-naphthyIaInin-A sulfonic acid with l-amino-7-naphthol,which dyestuff is, after being dried and pulverized,

in the shape of its sodium salt a dark pow-, der soluble in water with. a violet color and being soluble in concentrated sulfuric acid In testimony whereof I have hereunto set with a violet color; yielding upon reduction my hand in the presence of two subscribing with stannous chlorid and hydrochloric acid Witnesses.

1- naphthylaniin 4 sulfonic acid and 1.8 I WALTER KONIG. naphthylenedian1in7-naphthol; and dyeing W'itnesses:

Wool from acid baths violet-black shades, OTTO KGNIG,

substantially as described. 1 WILLY DRINIIAUS. 

